1K32

Crystal structure of the tricorn protease


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.245 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the tricorn protease reveals a protein disassembly line.

Brandstetter, H.Kim, J.S.Groll, M.Huber, R.

(2001) Nature 414: 466-470

  • DOI: 10.1038/35106609
  • Primary Citation of Related Structures:  
    1K32

  • PubMed Abstract: 
  • The degradation of cytosolic proteins is carried out predominantly by the proteasome, which generates peptides of 7-9 amino acids long. These products need further processing. Recently, a proteolytic system was identified in the model organism Thermoplas ...

    The degradation of cytosolic proteins is carried out predominantly by the proteasome, which generates peptides of 7-9 amino acids long. These products need further processing. Recently, a proteolytic system was identified in the model organism Thermoplasma acidophilum that performs this processing. The hexameric core protein of this modular system, referred to as tricorn protease, is a 720K protease that is able to assemble further into a giant icosahedral capsid, as determined by electron microscopy. Here, we present the crystal structure of the tricorn protease at 2.0 A resolution. The structure reveals a complex mosaic protein whereby five domains combine to form one of six subunits, which further assemble to form the 3-2-symmetric core protein. The structure shows how the individual domains coordinate the specific steps of substrate processing, including channelling of the substrate to, and the product from, the catalytic site. Moreover, the structure shows how accessory protein components might contribute to an even more complex protein machinery that efficiently collects the tricorn-released products.


    Organizational Affiliation

    Institute of Applied Radiation Chemistry, Technical University of Lodz, ul. Zeromskiego 116, 90-924 Lodz, Poland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tricorn protease ABCDEF1045Thermoplasma acidophilumMutation(s): 0 
Gene Names: Ta1490
EC: 3.4.21
Find proteins for P96086 (Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165))
Explore P96086 
Go to UniProtKB:  P96086
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.245 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.86α = 90
b = 245.998β = 105.296
c = 159.04γ = 90
Software Package:
Software NamePurpose
RSPSmodel building
MLPHAREphasing
MAINmodel building
SOLOMONphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
RSPSphasing
MAINphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-12-05
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance